The 2018 failure occurred over the Pacific Ocean, as the 777 was inbound to Honolulu. That jet’s PW4077 also lost its cowling, including its forward cowl, during the failure, and engine components punctured the jet’s fuselage.
The NTSB attributes the 2018 failure to “a full-length fan blade fracture”. Its report notes that P&W did not uncover blade fractures during a 2015 examination due to lack of formal and recurrent training for inspectors.
In December 2020, a Japan Air Lines 777-200 suffered failure of a PW4074, an incident involving loss of a panel and fan-blade damage. That aircraft also landed safely.
Other notable uncontained failures include two CFM International CFM56 events involving Southwest Airlines 737-700s – one in 2018 that killed one passenger, the other in 2016. And in 2017, an Air France Airbus A380’s Engine Alliance GP7200 suffered an uncontained failure over Greenland, investigators determined.